Method of precipitating copper



' can be easily. shipped to the sine l ter and 2 iron, to precipitate the copper, which is i atented Sept. 1, 19 25.

worse STA-TES- PATENT OFFICE.

amrnon or, r imcmurmo comma.

' Y U]; i' in Drawing}; Application mac/1 5mm, 1923i Serial in. 634,882.

I have succeeded in producing a precipitate of copper carbonate,-which is in a desirable formior smelting as well as for shipping to thesmelter. This result is attained by dissolving the copper sulphate, above referred to, and treating the solution -with powdered limestone, or calcium carbonate. A precipitate is formed in a few hours which is a mixture of copper can bonate and calcium sulphate, which may then be dried and shipped or stored, as de'- sired.

Havin therefore described my invention, what I c aim is The method of precipitating copper consisting in treating a solution of copper sulphate with pulverized lime stone, or calcium carbonate, whereby a precipitate of copper carbonate and calcium sulp ate is obtained.

BENJAMIN. H. BENNETIS;

To aZZ whom it may concern Be it known that I, BENJAMINJH. Blur- NETTS, a ritizen of the United States, residing z t/Tacoma, in the county of Pierce,

5 State of Washington, have invented certain new and usefullmprovements inMethods of Precipitating Copper, of which the ,following is a specification.

-My invention relates to a part of the treat- 10 ment of copper ore previous to its smelting and has for its objects to provide a cheap and efiicient means of producing a precipitate containing copper compounds which 1 handled thereat. I v

In the present practice of extractin copper, the ore is treated so as to pro uce a soluble, op'pper sulphate, and this solution 'is either treated electrolytically or with the? smoked. Both the electrolytic and iron treatments are, however, expensive. 

